摘要：Much as I would like to stay, I really must go home. (尽管我很想留下来，但我真的必须回家了。)[牛津高级学者辞典]

much as可用来表达让步，含义为although，如

【例句1】Much as I would like to stay, I really must go home. (尽管我很想留下来，但我真的必须回家了。)[牛津高级学者辞典]

【例句2】Much as they'd like to go home, they're resigned to staying until the end of the year. (尽管他们很想回家，但他们还是决定呆到年底。)[柯林斯高级学者辞典]

【例句3】Much as I like Bob, I wouldn't want to live with him. (尽管我很喜欢鲍勃，但我不想和他住在一起。)[朗文当代英语词典]

【例句4】Much as I would like to help you, I'm simply too busy at the moment. (尽管我很想帮你，但我现在太忙了。)[剑桥高级学者辞典]

as源自古英语alswa，相当于all so的缩略，含义大体为“全然如此”.

这里的much为副词，表达“程度深/强”，much as相当于“全然[到达]如此强的程度”，被反复使用后习化为让步连词。它用来引入某事实，该事实强化让刚才所说或即将说的话有相当令人惊讶的语效。

来源：弘霖教育